Tractor.



A.'M. DAVIS.

TRACTOR. 7 APPLICATION FILED Me. 7. 1917. I

Patented May 28,1918.

2 SHEETS-SHEH I.

WITNESSES Y 7 Hum/ 0R AMDavw' /l TTOR/UEVS ALMA MORGAN news, or Mesa, ARIZONA.

TnAoToR.

actose.

To all whom it may concern: 1 1

Be it known thatI, ALMA MORGAN DAVIS, a citizen of the United States,and a resident of Mesa, in the county of Maricopa and State of Arizona, have invented a new and Improved Tractor, of which the following is a full, clear, and exact description.

This invention relates totractors, and particularly to an improved power structure therefor, and has for an object the provision of an improved structurewhich will operate for moving in either direction, while allowing the master propelling member to move continuously in the same direction.

Another object in view is to provide a tractor in which earth engaging members are provided and connected up with a prime mover so as to push or pull a load.

A further object of the invention is to provide a tractor with earth engaging members and a reverse mechanism for reversing the earth engaging members without reversing the engine driving same.

In the accompanying drawings Figure 1 is a longitudinal vertical section through a device embodying the invention, same being taken approximately on line 11 of Fig. 7

Fig.4 is a view similar to Fig. I except that the parts are shown in their inactive or return position. Fig. 5 1s a view similar to Fig. 1, but showing the parts in the r reversed position.

Fig. 6 is a view similar to Fig. 5- showing the parts at the beginning of the power stroke in a reversed position.

Fig. 7 is a transverse sectional view through Fig. 1 on line 7-7.

Fig. 8 is a view similar to Fig. 1, but showing a double'contact member, certain parts being eliminated.

Referring to the accompanying drawings by numerals, 1 indicates a suitable frame, 2 supporting wheels. Connected with the frame 1 are a plurality of guides 3 as shown in Figs. 1 and 7 guiding the slides 4. It is evidentethat any desired number of slides andassociate parts may be used without departing from the spirit of the invention. Connected with each slide 4 are contact shoes and 6, shoe 5 acting as the ordinary Patented May 28, 1918. Application filed December 7, 1917. Serial N 0. 206,008-.

forward propelling member, While shoe 6" actsas a reverse power member. Shoe 5 is connected to the slide 4 by links 7 and 8 31V- otally connected to the shoe and to the s ide, while the shoe 6 is pivotally connected to slide 4 by links 9 and 10. Each of the shoes is divided centrally and hinged together so as to conform to the shape of the ground. A power link 11 is pivotally connected at '12 tothe slide 4 and at 13 to the crank 14.

Crank 14 is formed integral with, or rigidly secured to a shaft 15, which shaft is supported on frame 1 and is driven by engine 16 through any suitable means as for instance thebe'veled gears 17 (Fig. 7). A link 18 is pivo-tally connected with the crank 14 at 13 and also pivotally connected at 19 to the crank 20, which crank is driven by engine 16, The use of the crank 20 is to raise the shoe 5 when returning the parts fromthe full stroke position as shown in Fig. 3 to tion shown in Fig. 4 to that shown in Fig. 1,

and slide 4 on' the shoe 5 inovesforwardly and the shoe also moves downwardly until the shoe 5 is lifted during its return trip as the cranks 14 and 20 move from the posiit contacts withthe ground, after which it v remains in contact with the ground while power is exerted on the slide 4'and the shoe to urge the shaft 15, frame 1 and associate parts forwardly. A cable, chain, or other supporting member 21 is slack during the power stroke, but actsforraising the shoe during the return stroke. A cable, chain, or other member 22 is connected with shoe 5 and a cable 23 is connected with shoe 6 and also to the end 24 of the bell crank 25 and near the center of the lever 27 as shown in Fig. 5. When these levers are as shown in Fig. 1 the device is driving forwardly, but when the lever is moved to a vertical position, as shown in Fig. 5, cable 22 will raise permanently the shoe 5 and cable 23 will be slack so that the shoe may fall by gravity to the earth, or be forced against the earth by a spring or other means. As the crank 14 continues to rotate this will cause a reverse movement of the vehicle without reversing the motive power. llhe power stroke of the crank 14 in forward motion is the lower half of the revolution of crank 14 as in Fig. 2. The return stroke of crank 14 is the upper half of its revolution as shown Fig. i and the shoes 5 and 6 have the positions shown in Figs. 5 and GvVlien-the machine is in reverse motion. It will be seen that in order for the cable 28 to properly perform theiimc i 9 s the Shoe 6 atth i d of"the-power askets-(1 lowering shoe 6 'at the beginning of erma stroke i th reverse it is necessary for cable 28 to be t a i dflto a crank pposed to crank 114 wh h inl y b 1 on t e; smi -sha o nother. I w l thu b s en that when th parts-ar (mat ng forwa dly th le er .a saciat t shown in B g an ito ever cel i niof mov men o i h \ve i -Ll a v d-merementfilwer 27 1 -awe t Q 4 QsitiQ .is a-ll'thet iisn es ary, whe eupon th reh ele wi begin t mo e i th 0.99 si idire t o it algh h P w membe conti ues t Qpe at in th same d rect on- Q ewh 0 it1i Sh es 5andi spur 1mayih p esided t reus n vb tter g ippin action ofii the shoes when ,the device is in us li ip rt re n ded--,, 0;0ne at i q 'tp l l ll priri shin ia m y th us d with sl ds ve icl havingwhee 19 Othe rim t 1 mov bu i ipr t rab y u ed w er tomper t rely l w ,pmeres is ah -bisr ai ir a tc nsider l P w Ha e-=8 wil ih e niaisli htlymo ifie s-f nml i he nv nt n w ch th powe shaft 14 is connected to links 29 an di30 hich disk en a e sli e fi and i 32 $1 it ssl d fiewh tehyi h i l b m d n -s ic s ith i ron an nea l -h se ei h fsam i si i ll -ir hi l .I i evid nt i he tt ir epe ias m ans in ay h ius i a 'aars numbe w tho departin ffomth Spi i 9 th ifl t llfii niWlie' el m eat -1 th eh ract described,

sa aly suppe tie m m e xto seepa e s li rert i fs i .ibedy, a suid way enne t j EW said snide i sl ggu de my; ai

way, a tract n l c co nec ed w th said slide by r reta ehlmlqmotio ,apowe member arranged in said body, means for connecting the power member with the slide for c ausing the slide to reciprocate, and means operated by the power member for raising said shoe when said slide is moving in one direction.

2L Atractor of the character described, comprising a body, supporting members therefor, a plurality of slides supported by said body, a pair of.tracti01r shoes ,for each slide, each of said traction shoesibeing connected with the respective slides by a parallel dink anotion, power means {for reciprocating ,=said slides, means {for raising .said [shPe's .duringithe 5 travel ,ofosaid, slide till: one direction, and means .fQl, maintaining one of said shoes 'in an elevated position during the movement, of said slide nvhereby the. dc- ;viceimaybe propelled in either direction.

,3. A tractor of thercharacter described, comprising a body, supporting means for supporting-said body, a (plurality of pairs of guides" support-ed {by said body :and extending longitudinally thereof, a slide s11 p- .ported vand f guided iby .each' pair of guides, .a;p air.0.f-"shoes foreachslide, aplurality of links connecting said, shoeswith said guides, said links being: arranged to produce a a parallelinlotion, a connecting rod 1 pivotallyi con- .Iiected Witheach of said slides, a crank con ,rnecteddwithefach of saidconnecting rods, a

power member for rotating vsaid cranks thereby reciprocatingsaid slides, means operated by said poweranember for maintaining ,oneof said Zshoes connected .with each ;slide in'an ieleviated position, said'means being capable of reversing so that either 1;,slioe ma be: brought in contact with the ground at any. time andthel'device propelled Lin'eitherdirection Without reversingthe dikrection ,Iof imovement of said cranks, and means for raising said [shoes from the ground at :the completion of each power stroke thereof;

MQRGAN DAVIS.

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